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    SubjectRe: 2.6.31-rc5 regression: Oops when USB Serial disconnected while in use
    On Fri, 21 August 2009 Alan Stern <stern@rowland.harvard.edu> wrote:
    > On Fri, 21 Aug 2009, Bruno [UTF-8] Prémont wrote:
    >
    > > The module refcount was for both. It's the pl2302/ftdi-sio module's
    > > refcount.
    > >
    > > I don't remember for sure about the panic if it also affects
    > > pl2302 or not.
    > > At least one of the panics was when running dmesg after exiting
    > > minicom.
    > >
    > > I will redo the tests this evening when I get home and report back
    > > with more details.
    >
    > Apparently the problem is in serial_do_free(); it doesn't know
    > whether it's getting called for a successful open or an unsuccessful
    > open, so it decrements the module count when it shouldn't. The same
    > is true for port->dev's refcount.

    That makes sense, see below dmesg log extracts (from USB plug-in until
    after exiting minicom), there are two calls to serial_do_free().

    On USB disconnect module refcount is zero, on minicom exit it underflows.

    > Alan, related to this problem is the fact that usb_serial_driver
    > doesn't include a "hangup" method. I'm not sure that making
    > serial_hangup() call serial_do_down() is correct, but if it is then
    > shouldn't we call port->serial->type->open() afterwards? Otherwise
    > the lower driver can't know that the port is still open.
    >
    > Furthermore, shouldn't we check ASYNCB_INITIALIZED in serial_close()?
    >
    > Alan Stern

    This time I had no crash (neither with ftdi nor with pl2302), possibly
    a matter of what memory areas were affected...

    Bruno


    dmesg + lsmod as at end of dmesg log. First for ftdi device, second for
    pl2302 device:

    [ 389.940038] usb 1-2: new full speed USB device using uhci_hcd and address 2
    [ 390.158982] usb 1-2: New USB device found, idVendor=9e88, idProduct=9e8f
    [ 390.159202] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
    [ 390.159447] usb 1-2: Product: SheevaPlug JTAGKey FT2232D B
    [ 390.159622] usb 1-2: Manufacturer: FTDI
    [ 390.159763] usb 1-2: SerialNumber: FTS55QK6
    [ 390.160160] usb 1-2: configuration #1 chosen from 1 choice
    [ 390.243200] usbcore: registered new interface driver usbserial
    [ 390.243309] usbserial: USB Serial Driver core
    [ 390.274397] USB Serial support registered for FTDI USB Serial Device
    [ 390.274888] usb 1-2: Ignoring serial port reserved for JTAG
    [ 390.275185] ftdi_sio 1-2:1.1: FTDI USB Serial Device converter detected
    [ 390.275467] usb 1-2: Detected FT2232C
    [ 390.275589] usb 1-2: Number of endpoints 2
    [ 390.275740] usb 1-2: Endpoint 1 MaxPacketSize 64
    [ 390.275888] usb 1-2: Endpoint 2 MaxPacketSize 64
    [ 390.276052] usb 1-2: Setting MaxPacketSize 64
    [ 390.278136] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0
    [ 390.278435] usbcore: registered new interface driver ftdi_sio
    [ 390.278619] ftdi_sio: v1.5.0:USB FTDI Serial Converters Driver
    [ 394.507447] usb_serial_get_by_index(index 0): @dd0b88a0
    [ 394.507642] ------------[ cut here ]------------
    [ 394.507836] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:78 usb_serial_get_by_index+0x42/0x70 [usbserial]()
    [ 394.508189] Hardware name: TravelMate 660
    [ 394.508334] Modules linked in: ftdi_sio usbserial usb_storage squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop snd_intel8x0 nsc_ircc snd_ac97_codec ac97_bus irda snd_pcm snd_timer snd i2c_i801 ehci_hcd uhci_hcd usbcore snd_page_alloc pcspkr crc_ccitt
    [ 394.509752] Pid: 3116, comm: minicom Tainted: G M 2.6.31-rc6 #1
    [ 394.509959] Call Trace:
    [ 394.510089] [<c12b7052>] ? printk+0x18/0x1e
    [ 394.510241] [<df57b182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 394.510480] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 394.510660] [<df57b182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 394.510894] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 394.511068] [<df57b182>] usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 394.511304] [<df57b36d>] serial_open+0x2d/0x250 [usbserial]
    [ 394.511490] [<c115f7b9>] ? tty_init_dev+0x89/0x160
    [ 394.511666] [<c115fa4d>] tty_open+0x1bd/0x4b0
    [ 394.511815] [<c1077566>] chrdev_open+0x96/0x140
    [ 394.511986] [<c10732ff>] __dentry_open+0x9f/0x250
    [ 394.512144] [<c1073599>] nameidata_to_filp+0x59/0x70
    [ 394.512324] [<c10774d0>] ? chrdev_open+0x0/0x140
    [ 394.512478] [<c107f889>] do_filp_open+0x269/0x890
    [ 394.512652] [<c1038c5c>] ? ktime_get_ts+0x4c/0x50
    [ 394.512812] [<c10730c7>] do_sys_open+0x57/0x140
    [ 394.512983] [<c1026d55>] ? alarm_setitimer+0x35/0x70
    [ 394.513148] [<c1073219>] sys_open+0x29/0x40
    [ 394.513306] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 394.513466] ---[ end trace a4862da83be6d4cc ]---
    [ 410.250064] usb 1-2: USB disconnect, address 2
    [ 410.250628] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
    [ 410.250935] usb_serial_put(serial @dd0b88a0)
    [ 410.251074] ------------[ cut here ]------------
    [ 410.251257] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:179 usb_serial_put+0x2b/0x60 [usbserial]()
    [ 410.251586] Hardware name: TravelMate 660
    [ 410.251730] Modules linked in: ftdi_sio usbserial usb_storage squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop snd_intel8x0 nsc_ircc snd_ac97_codec ac97_bus irda snd_pcm snd_timer snd i2c_i801 ehci_hcd uhci_hcd usbcore snd_page_alloc pcspkr crc_ccitt
    [ 410.253139] Pid: 976, comm: khubd Tainted: G M W 2.6.31-rc6 #1
    [ 410.253339] Call Trace:
    [ 410.253448] [<c12b7052>] ? printk+0x18/0x1e
    [ 410.253598] [<df57aceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 410.253813] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 410.253992] [<df57aceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 410.254202] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 410.254376] [<df57aceb>] usb_serial_put+0x2b/0x60 [usbserial]
    [ 410.254588] [<df57af81>] usb_serial_disconnect+0xf1/0x160 [usbserial]
    [ 410.254835] [<dea3f447>] ? usb_disable_interface+0x37/0x50 [usbcore]
    [ 410.255086] [<dea42221>] usb_unbind_interface+0xf1/0x130 [usbcore]
    [ 410.255293] [<c11b5441>] __device_release_driver+0x51/0xa0
    [ 410.255491] [<c11b5540>] device_release_driver+0x20/0x40
    [ 410.255666] [<c11b4aad>] bus_remove_device+0x7d/0xb0
    [ 410.255847] [<c11b2ef2>] device_del+0x102/0x190
    [ 410.256025] [<dea3f3a7>] usb_disable_device+0x87/0xf0 [usbcore]
    [ 410.256259] [<dea3a8a6>] usb_disconnect+0x96/0xf0 [usbcore]
    [ 410.256469] [<dea3b989>] hub_thread+0x829/0x1210 [usbcore]
    [ 410.256672] [<c10357a0>] ? autoremove_wake_function+0x0/0x50
    [ 410.256882] [<dea3b160>] ? hub_thread+0x0/0x1210 [usbcore]
    [ 410.257079] [<c10353cc>] kthread+0x7c/0x90
    [ 410.257217] [<c1035350>] ? kthread+0x0/0x90
    [ 410.257376] [<c1003673>] kernel_thread_helper+0x7/0x14
    [ 410.257543] ---[ end trace a4862da83be6d4cd ]---
    [ 410.257708] ftdi_sio 1-2:1.1: device disconnected
    [ 410.258188] usb_serial_get_by_index(index 0): @dd0b88a0
    [ 410.258358] ------------[ cut here ]------------
    [ 410.258537] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:78 usb_serial_get_by_index+0x42/0x70 [usbserial]()
    [ 410.258887] Hardware name: TravelMate 660
    [ 410.259031] Modules linked in: ftdi_sio usbserial usb_storage squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop snd_intel8x0 nsc_ircc snd_ac97_codec ac97_bus irda snd_pcm snd_timer snd i2c_i801 ehci_hcd uhci_hcd usbcore snd_page_alloc pcspkr crc_ccitt
    [ 410.260453] Pid: 3116, comm: minicom Tainted: G M W 2.6.31-rc6 #1
    [ 410.260660] Call Trace:
    [ 410.260763] [<c12b7052>] ? printk+0x18/0x1e
    [ 410.260912] [<df57b182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 410.261161] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 410.261340] [<df57b182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 410.261589] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 410.261763] [<df57b182>] usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 410.262012] [<df57b36d>] serial_open+0x2d/0x250 [usbserial]
    [ 410.262198] [<c10897b6>] ? mntput_no_expire+0x16/0x60
    [ 410.262384] [<c115fa4d>] tty_open+0x1bd/0x4b0
    [ 410.262531] [<c1077566>] chrdev_open+0x96/0x140
    [ 410.262701] [<c10732ff>] __dentry_open+0x9f/0x250
    [ 410.262859] [<c1073599>] nameidata_to_filp+0x59/0x70
    [ 410.263040] [<c10774d0>] ? chrdev_open+0x0/0x140
    [ 410.263194] [<c107f889>] do_filp_open+0x269/0x890
    [ 410.263367] [<c1038c5c>] ? ktime_get_ts+0x4c/0x50
    [ 410.273068] [<c10730c7>] do_sys_open+0x57/0x140
    [ 410.283083] [<c1026d55>] ? alarm_setitimer+0x35/0x70
    [ 410.293149] [<c1073219>] sys_open+0x29/0x40
    [ 410.303259] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 410.313388] ---[ end trace a4862da83be6d4ce ]---
    [ 410.331134] tty_port_close_start: count = -1
    [ 410.335326] serial_do_free(port @d8c72400)
    [ 410.339451] serial @dd0b88a0
    [ 410.343874] type @df5d8660
    [ 410.348150] usb_serial_put(serial @dd0b88a0)
    [ 410.352244] ------------[ cut here ]------------
    [ 410.356280] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:179 usb_serial_put+0x2b/0x60 [usbserial]()
    [ 410.360483] Hardware name: TravelMate 660
    [ 410.364569] Modules linked in: ftdi_sio usbserial usb_storage squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop snd_intel8x0 nsc_ircc snd_ac97_codec ac97_bus irda snd_pcm snd_timer snd i2c_i801 ehci_hcd uhci_hcd usbcore snd_page_alloc pcspkr crc_ccitt
    [ 410.373535] Pid: 3116, comm: minicom Tainted: G M W 2.6.31-rc6 #1
    [ 410.377676] Call Trace:
    [ 410.381732] [<c12b7052>] ? printk+0x18/0x1e
    [ 410.385770] [<df57aceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 410.389857] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 410.393946] [<df57aceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 410.398034] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 410.402115] [<df57aceb>] usb_serial_put+0x2b/0x60 [usbserial]
    [ 410.406209] [<df57adb9>] serial_do_free+0x99/0xd0 [usbserial]
    [ 410.410283] [<df57ae57>] serial_close+0x67/0xa0 [usbserial]
    [ 410.414352] [<c115d1a5>] ? tty_fasync+0x55/0xe0
    [ 410.418378] [<c115f2e0>] tty_release_dev+0x130/0x490
    [ 410.422426] [<c102372e>] ? warn_slowpath_common+0x9e/0xc0
    [ 410.426440] [<c10207e3>] ? __cond_resched+0x23/0x40
    [ 410.430475] [<c12b7555>] ? _cond_resched+0x25/0x40
    [ 410.434478] [<c12b7d7e>] ? mutex_lock+0xe/0x20
    [ 410.438499] [<df57b3a9>] ? serial_open+0x69/0x250 [usbserial]
    [ 410.442530] [<c115fced>] tty_open+0x45d/0x4b0
    [ 410.446533] [<c1077566>] chrdev_open+0x96/0x140
    [ 410.450546] [<c10732ff>] __dentry_open+0x9f/0x250
    [ 410.454546] [<c1073599>] nameidata_to_filp+0x59/0x70
    [ 410.458525] [<c10774d0>] ? chrdev_open+0x0/0x140
    [ 410.462523] [<c107f889>] do_filp_open+0x269/0x890
    [ 410.466498] [<c1038c5c>] ? ktime_get_ts+0x4c/0x50
    [ 410.470499] [<c10730c7>] do_sys_open+0x57/0x140
    [ 410.474455] [<c1026d55>] ? alarm_setitimer+0x35/0x70
    [ 410.478424] [<c1073219>] sys_open+0x29/0x40
    [ 410.482384] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 410.486332] ---[ end trace a4862da83be6d4cf ]---
    [ 518.992741] serial_do_free(port @d8c72400)
    [ 518.992888] serial @dd0b88a0
    [ 518.993010] type @df5d8660
    [ 518.993115] usb_serial_put(serial @dd0b88a0)
    [ 518.993268] ------------[ cut here ]------------
    [ 518.993435] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:179 usb_serial_put+0x2b/0x60 [usbserial]()
    [ 518.993794] Hardware name: TravelMate 660
    [ 518.993923] Modules linked in: ftdi_sio usbserial usb_storage squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop snd_intel8x0 nsc_ircc snd_ac97_codec ac97_bus irda snd_pcm snd_timer snd i2c_i801 ehci_hcd uhci_hcd usbcore snd_page_alloc pcspkr crc_ccitt
    [ 518.995333] Pid: 3116, comm: minicom Tainted: G M W 2.6.31-rc6 #1
    [ 518.995571] Call Trace:
    [ 518.995665] [<c12b7052>] ? printk+0x18/0x1e
    [ 518.995830] [<df57aceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 518.996029] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 518.996225] [<df57aceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 518.996419] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 518.996609] [<df57aceb>] usb_serial_put+0x2b/0x60 [usbserial]
    [ 518.996804] [<df57adb9>] serial_do_free+0x99/0xd0 [usbserial]
    [ 518.997016] [<df57ae57>] serial_close+0x67/0xa0 [usbserial]
    [ 518.997200] [<c115d1a5>] ? tty_fasync+0x55/0xe0
    [ 518.997369] [<c115f2e0>] tty_release_dev+0x130/0x490
    [ 518.997539] [<c1056d72>] ? put_page+0x42/0x120
    [ 518.997708] [<c10897b6>] ? mntput_no_expire+0x16/0x60
    [ 518.997875] [<c115f64a>] tty_release+0xa/0x10
    [ 518.998037] [<c1075f1c>] __fput+0xdc/0x1d0
    [ 518.998174] [<c107602f>] fput+0x1f/0x30
    [ 518.998323] [<c1072f8e>] filp_close+0x3e/0x70
    [ 518.998470] [<c1024fa2>] put_files_struct+0xa2/0xc0
    [ 518.998648] [<c1024fdc>] exit_files+0x1c/0x20
    [ 518.998795] [<c1026339>] do_exit+0xb9/0x630
    [ 518.998954] [<c103acd8>] ? __put_cred+0x18/0x20
    [ 518.999107] [<c10268dd>] do_group_exit+0x2d/0x80
    [ 518.999277] [<c1026943>] sys_exit_group+0x13/0x20
    [ 518.999434] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 518.999610] ---[ end trace a4862da83be6d4d0 ]---
    [ 518.999758] destroy_serial(kref @dd0b88d4)
    [ 518.999905] serial @dd0b88a0

    Module Size Used by
    ftdi_sio 51372 4294967295
    usbserial 31164 1 ftdi_sio
    usb_storage 49504 0
    squashfs 20936 1
    zlib_inflate 16164 1 squashfs
    nfs 141068 0
    lockd 65768 1 nfs
    nfs_acl 2884 1 nfs
    sunrpc 170044 3 nfs,lockd,nfs_acl
    8021q 19872 0
    snd_pcm_oss 36096 0
    snd_mixer_oss 14564 1 snd_pcm_oss
    xfs 483008 1
    exportfs 3844 1 xfs
    loop 14352 2
    snd_intel8x0 29792 0
    nsc_ircc 16112 0
    snd_ac97_codec 101540 1 snd_intel8x0
    ac97_bus 1540 1 snd_ac97_codec
    irda 101496 1 nsc_ircc
    snd_pcm 60524 3 snd_pcm_oss,snd_intel8x0,snd_ac97_codec
    snd_timer 18344 1 snd_pcm
    snd 48772 6 snd_pcm_oss,snd_mixer_oss,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer
    i2c_i801 8500 0
    ehci_hcd 33972 0
    uhci_hcd 21876 0
    usbcore 133920 5 ftdi_sio,usbserial,usb_storage,ehci_hcd,uhci_hcd
    snd_page_alloc 8044 2 snd_intel8x0,snd_pcm
    pcspkr 2276 0
    crc_ccitt 1796 1 irda




    [ 691.010035] usb 1-1: new full speed USB device using uhci_hcd and address 2
    [ 691.176987] usb 1-1: New USB device found, idVendor=067b, idProduct=2303
    [ 691.177206] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
    [ 691.177451] usb 1-1: Product: USB-Serial Controller
    [ 691.177608] usb 1-1: Manufacturer: Prolific Technology Inc.
    [ 691.178025] usb 1-1: configuration #1 chosen from 1 choice
    [ 691.254399] usbcore: registered new interface driver usbserial
    [ 691.254507] usbserial: USB Serial Driver core
    [ 691.274470] USB Serial support registered for pl2303
    [ 691.274732] pl2303 1-1:1.0: pl2303 converter detected
    [ 691.286169] usb 1-1: pl2303 converter now attached to ttyUSB0
    [ 691.286430] usbcore: registered new interface driver pl2303
    [ 691.286610] pl2303: Prolific PL2303 USB to serial adaptor driver
    [ 702.598739] usb_serial_get_by_index(index 0): @da6a3780
    [ 702.598931] ------------[ cut here ]------------
    [ 702.599124] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:78 usb_serial_get_by_index+0x42/0x70 [usbserial]()
    [ 702.599476] Hardware name: TravelMate 660
    [ 702.599621] Modules linked in: pl2303 usbserial squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop usb_storage snd_intel8x0 snd_ac97_codec ac97_bus nsc_ircc irda snd_pcm snd_timer snd ehci_hcd pcspkr i2c_i801 uhci_hcd snd_page_alloc crc_ccitt usbcore
    [ 702.601064] Pid: 2528, comm: minicom Tainted: G M 2.6.31-rc6 #1
    [ 702.601272] Call Trace:
    [ 702.601383] [<c12b7052>] ? printk+0x18/0x1e
    [ 702.601532] [<deb16182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 702.601771] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 702.601950] [<deb16182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 702.602198] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 702.602372] [<deb16182>] usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 702.602621] [<deb1636d>] serial_open+0x2d/0x250 [usbserial]
    [ 702.602806] [<c115f7b9>] ? tty_init_dev+0x89/0x160
    [ 702.602981] [<c115fa4d>] tty_open+0x1bd/0x4b0
    [ 702.603129] [<c1077566>] chrdev_open+0x96/0x140
    [ 702.603300] [<c10732ff>] __dentry_open+0x9f/0x250
    [ 702.603457] [<c1073599>] nameidata_to_filp+0x59/0x70
    [ 702.603637] [<c10774d0>] ? chrdev_open+0x0/0x140
    [ 702.603793] [<c107f889>] do_filp_open+0x269/0x890
    [ 702.603966] [<c1038c5c>] ? ktime_get_ts+0x4c/0x50
    [ 702.604126] [<c10730c7>] do_sys_open+0x57/0x140
    [ 702.604296] [<c1026d55>] ? alarm_setitimer+0x35/0x70
    [ 702.604461] [<c1073219>] sys_open+0x29/0x40
    [ 702.604619] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 702.604779] ---[ end trace 11618bfb3543f78d ]---
    [ 733.750062] usb 1-1: USB disconnect, address 2
    [ 733.751174] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
    [ 733.751434] usb_serial_put(serial @da6a3780)
    [ 733.751573] ------------[ cut here ]------------
    [ 733.751756] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:179 usb_serial_put+0x2b/0x60 [usbserial]()
    [ 733.752096] Hardware name: TravelMate 660
    [ 733.752241] Modules linked in: pl2303 usbserial squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop usb_storage snd_intel8x0 snd_ac97_codec ac97_bus nsc_ircc irda snd_pcm snd_timer snd ehci_hcd pcspkr i2c_i801 uhci_hcd snd_page_alloc crc_ccitt usbcore
    [ 733.753645] Pid: 956, comm: khubd Tainted: G M W 2.6.31-rc6 #1
    [ 733.753846] Call Trace:
    [ 733.753954] [<c12b7052>] ? printk+0x18/0x1e
    [ 733.754103] [<deb15ceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 733.754317] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 733.754497] [<deb15ceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 733.754707] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 733.754880] [<deb15ceb>] usb_serial_put+0x2b/0x60 [usbserial]
    [ 733.755092] [<deb15f81>] usb_serial_disconnect+0xf1/0x160 [usbserial]
    [ 733.755339] [<dea0c447>] ? usb_disable_interface+0x37/0x50 [usbcore]
    [ 733.755590] [<dea0f221>] usb_unbind_interface+0xf1/0x130 [usbcore]
    [ 733.755797] [<c11b5441>] __device_release_driver+0x51/0xa0
    [ 733.755994] [<c11b5540>] device_release_driver+0x20/0x40
    [ 733.756169] [<c11b4aad>] bus_remove_device+0x7d/0xb0
    [ 733.756349] [<c11b2ef2>] device_del+0x102/0x190
    [ 733.756528] [<dea0c3a7>] usb_disable_device+0x87/0xf0 [usbcore]
    [ 733.756762] [<dea078a6>] usb_disconnect+0x96/0xf0 [usbcore]
    [ 733.756971] [<dea08989>] hub_thread+0x829/0x1210 [usbcore]
    [ 733.757175] [<c10357a0>] ? autoremove_wake_function+0x0/0x50
    [ 733.757386] [<dea08160>] ? hub_thread+0x0/0x1210 [usbcore]
    [ 733.757584] [<c10353cc>] kthread+0x7c/0x90
    [ 733.757722] [<c1035350>] ? kthread+0x0/0x90
    [ 733.757881] [<c1003673>] kernel_thread_helper+0x7/0x14
    [ 733.758049] ---[ end trace 11618bfb3543f78e ]---
    [ 733.758213] pl2303 1-1:1.0: device disconnected
    [ 733.759141] usb_serial_get_by_index(index 0): @da6a3780
    [ 733.759316] ------------[ cut here ]------------
    [ 733.759497] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:78 usb_serial_get_by_index+0x42/0x70 [usbserial]()
    [ 733.759847] Hardware name: TravelMate 660
    [ 733.759992] Modules linked in: pl2303 usbserial squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop usb_storage snd_intel8x0 snd_ac97_codec ac97_bus nsc_ircc irda snd_pcm snd_timer snd ehci_hcd pcspkr i2c_i801 uhci_hcd snd_page_alloc crc_ccitt usbcore
    [ 733.761423] Pid: 2528, comm: minicom Tainted: G M W 2.6.31-rc6 #1
    [ 733.761660] Call Trace:
    [ 733.761750] [<c12b7052>] ? printk+0x18/0x1e
    [ 733.761914] [<deb16182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 733.762133] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 733.762329] [<deb16182>] ? usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 733.762547] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 733.762737] [<deb16182>] usb_serial_get_by_index+0x42/0x70 [usbserial]
    [ 733.762957] [<deb1636d>] serial_open+0x2d/0x250 [usbserial]
    [ 733.763159] [<c10897b6>] ? mntput_no_expire+0x16/0x60
    [ 733.763328] [<c115fa4d>] tty_open+0x1bd/0x4b0
    [ 733.763492] [<c1077566>] chrdev_open+0x96/0x140
    [ 733.763647] [<c10732ff>] __dentry_open+0x9f/0x250
    [ 733.763821] [<c1073599>] nameidata_to_filp+0x59/0x70
    [ 733.763985] [<c10774d0>] ? chrdev_open+0x0/0x140
    [ 733.764155] [<c107f889>] do_filp_open+0x269/0x890
    [ 733.764313] [<c1038c5c>] ? ktime_get_ts+0x4c/0x50
    [ 733.773926] [<c10730c7>] do_sys_open+0x57/0x140
    [ 733.783856] [<c1026d55>] ? alarm_setitimer+0x35/0x70
    [ 733.793832] [<c1073219>] sys_open+0x29/0x40
    [ 733.803856] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 733.813897] ---[ end trace 11618bfb3543f78f ]---
    [ 733.829386] tty_port_close_start: count = -1
    [ 733.930036] serial_do_free(port @dd86ae00)
    [ 733.940088] serial @da6a3780
    [ 733.950089] type @deb25c20
    [ 733.960455] usb_serial_put(serial @da6a3780)
    [ 733.964507] ------------[ cut here ]------------
    [ 733.968561] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:179 usb_serial_put+0x2b/0x60 [usbserial]()
    [ 733.973026] Hardware name: TravelMate 660
    [ 733.977130] Modules linked in: pl2303 usbserial squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop usb_storage snd_intel8x0 snd_ac97_codec ac97_bus nsc_ircc irda snd_pcm snd_timer snd ehci_hcd pcspkr i2c_i801 uhci_hcd snd_page_alloc crc_ccitt usbcore
    [ 733.986053] Pid: 2528, comm: minicom Tainted: G M W 2.6.31-rc6 #1
    [ 733.990213] Call Trace:
    [ 733.994262] [<c12b7052>] ? printk+0x18/0x1e
    [ 733.998300] [<deb15ceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 734.002543] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 734.006612] [<deb15ceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 734.010724] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 734.014796] [<deb15ceb>] usb_serial_put+0x2b/0x60 [usbserial]
    [ 734.018898] [<deb15db9>] serial_do_free+0x99/0xd0 [usbserial]
    [ 734.022988] [<deb15e57>] serial_close+0x67/0xa0 [usbserial]
    [ 734.027062] [<c115d1a5>] ? tty_fasync+0x55/0xe0
    [ 734.031105] [<c115f2e0>] tty_release_dev+0x130/0x490
    [ 734.035140] [<c102372e>] ? warn_slowpath_common+0x9e/0xc0
    [ 734.039158] [<c10207e3>] ? __cond_resched+0x23/0x40
    [ 734.043201] [<c12b7555>] ? _cond_resched+0x25/0x40
    [ 734.047213] [<c12b7d7e>] ? mutex_lock+0xe/0x20
    [ 734.051243] [<deb163a9>] ? serial_open+0x69/0x250 [usbserial]
    [ 734.055258] [<c115fced>] tty_open+0x45d/0x4b0
    [ 734.059281] [<c1077566>] chrdev_open+0x96/0x140
    [ 734.063302] [<c10732ff>] __dentry_open+0x9f/0x250
    [ 734.067307] [<c1073599>] nameidata_to_filp+0x59/0x70
    [ 734.071304] [<c10774d0>] ? chrdev_open+0x0/0x140
    [ 734.075288] [<c107f889>] do_filp_open+0x269/0x890
    [ 734.079264] [<c1038c5c>] ? ktime_get_ts+0x4c/0x50
    [ 734.083275] [<c10730c7>] do_sys_open+0x57/0x140
    [ 734.087234] [<c1026d55>] ? alarm_setitimer+0x35/0x70
    [ 734.091225] [<c1073219>] sys_open+0x29/0x40
    [ 734.095170] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 734.099124] ---[ end trace 11618bfb3543f790 ]---
    [ 834.133234] serial_do_free(port @dd86ae00)
    [ 834.133379] serial @da6a3780
    [ 834.133499] type @deb25c20
    [ 834.133621] usb_serial_put(serial @da6a3780)
    [ 834.133757] ------------[ cut here ]------------
    [ 834.133939] WARNING: at /usr/src/linux-2.6/drivers/usb/serial/usb-serial.c:179 usb_serial_put+0x2b/0x60 [usbserial]()
    [ 834.134266] Hardware name: TravelMate 660
    [ 834.134410] Modules linked in: pl2303 usbserial squashfs zlib_inflate nfs lockd nfs_acl sunrpc 8021q snd_pcm_oss snd_mixer_oss xfs exportfs loop usb_storage snd_intel8x0 snd_ac97_codec ac97_bus nsc_ircc irda snd_pcm snd_timer snd ehci_hcd pcspkr i2c_i801 uhci_hcd snd_page_alloc crc_ccitt usbcore
    [ 834.135811] Pid: 2528, comm: minicom Tainted: G M W 2.6.31-rc6 #1
    [ 834.136018] Call Trace:
    [ 834.136127] [<c12b7052>] ? printk+0x18/0x1e
    [ 834.136276] [<deb15ceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 834.136489] [<c10236fc>] warn_slowpath_common+0x6c/0xc0
    [ 834.136669] [<deb15ceb>] ? usb_serial_put+0x2b/0x60 [usbserial]
    [ 834.136878] [<c1023765>] warn_slowpath_null+0x15/0x20
    [ 834.137051] [<deb15ceb>] usb_serial_put+0x2b/0x60 [usbserial]
    [ 834.137262] [<deb15db9>] serial_do_free+0x99/0xd0 [usbserial]
    [ 834.137457] [<deb15e57>] serial_close+0x67/0xa0 [usbserial]
    [ 834.137658] [<c115d1a5>] ? tty_fasync+0x55/0xe0
    [ 834.137810] [<c115f2e0>] tty_release_dev+0x130/0x490
    [ 834.137995] [<c1056d72>] ? put_page+0x42/0x120
    [ 834.138148] [<c10897b6>] ? mntput_no_expire+0x16/0x60
    [ 834.138331] [<c115f64a>] tty_release+0xa/0x10
    [ 834.138477] [<c1075f1c>] __fput+0xdc/0x1d0
    [ 834.138630] [<c107602f>] fput+0x1f/0x30
    [ 834.138763] [<c1072f8e>] filp_close+0x3e/0x70
    [ 834.138926] [<c1024fa2>] put_files_struct+0xa2/0xc0
    [ 834.139088] [<c1024fdc>] exit_files+0x1c/0x20
    [ 834.139251] [<c1026339>] do_exit+0xb9/0x630
    [ 834.139393] [<c103acd8>] ? __put_cred+0x18/0x20
    [ 834.139562] [<c10268dd>] do_group_exit+0x2d/0x80
    [ 834.139717] [<c1026943>] sys_exit_group+0x13/0x20
    [ 834.139890] [<c1002e08>] sysenter_do_call+0x12/0x26
    [ 834.140084] ---[ end trace 11618bfb3543f791 ]---
    [ 834.141308] destroy_serial(kref @da6a37b4)
    [ 834.141366] serial @da6a3780

    Module Size Used by
    pl2303 16808 4294967295
    usbserial 31164 1 pl2303
    squashfs 20936 1
    zlib_inflate 16164 1 squashfs
    nfs 141068 0
    lockd 65768 1 nfs
    nfs_acl 2884 1 nfs
    sunrpc 170044 3 nfs,lockd,nfs_acl
    8021q 19872 0
    snd_pcm_oss 36096 0
    snd_mixer_oss 14564 1 snd_pcm_oss
    xfs 483008 1
    exportfs 3844 1 xfs
    loop 14352 2
    usb_storage 49504 0
    snd_intel8x0 29792 0
    snd_ac97_codec 101540 1 snd_intel8x0
    ac97_bus 1540 1 snd_ac97_codec
    nsc_ircc 16112 0
    irda 101496 1 nsc_ircc
    snd_pcm 60524 3 snd_pcm_oss,snd_intel8x0,snd_ac97_codec
    snd_timer 18344 1 snd_pcm
    snd 48772 6 snd_pcm_oss,snd_mixer_oss,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer
    ehci_hcd 33972 0
    pcspkr 2276 0
    i2c_i801 8500 0
    uhci_hcd 21876 0
    snd_page_alloc 8044 2 snd_intel8x0,snd_pcm
    crc_ccitt 1796 1 irda
    usbcore 133920 5 pl2303,usbserial,usb_storage,ehci_hcd,uhci_hcd



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      Last update: 2009-08-21 18:53    [W:0.062 / U:0.732 seconds]
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